73M1903 Datasheet | TDK Semiconductor

DESCRIPTION The TDK 73M1903 Analog Front End (AFE) IC includes fully differential hybrid driver outputs, which connect to the telephone line interface through a transformer-based DAA. The receive pins are also fully differential for maximum flexibility and performance. This arrangement allows for the design of a high performance hybrid circuit to improve signal to noise performance under low receive level conditions, and patibility with any standard transformer intended for PSTN munications applications. The device incorporates a programmable sample rate circuit to support soft modem and DSP based implementations of all speeds up to V.92 (56Kbps). The sampling rates supported are from 7.2k Hz to 14.4k Hz by programming pre-scaler NCO and PLL NCO. The TDK 73M1903 device incorporates a digital host interface that is patible with the serial ports found on most mercially available DSPs and processors and exchanges both payload and control information with the host. Cost saving Features of the device include an input reference frequency circuit, which accepts a range of crystals from 9-27MHz. It also accepts external reference clock values between 9-40MHz generated by the host processor. In most applications, this eliminates the need for a dedicated crystal oscillator and reduces the bill of material (BOM). The 73M1903 also supports two analog loop back and one digital loop back test modes. The 73M1903 in 32-TQFP package is footprint patible with 73M2901CL embedded modem and allows for the same circuit design to acmodate soft modem, V.22bis hard modem, and high speed (V.32bis/V.34/V.92) applications through population of an external data pump device. 73M1903 Modem Analog Front End PRODUCT DATA SHEET JANUARY 2004 Features - Up to 56Kbps (V.92) performance - Programmable sample rates (7.2 - 14.4k Hz) - Reference clock range of 9-40MHz - Crystal frequency range of 9-27MHZ - Host synchronous serial interface operation - Pin patible with 73M2901CL modem -...